"We also have a lot of night activity up here, a lot of kids who come to play or other things. We have a lot of homeless people who wander around so, who knows," said Julie Kendall, a San Francisco resident.

Some are now questioning if they are safe here. "I will be thinking twice about running here early in the morning by myself," one jogger told ABC7 News.Anyone with information about this is asked to call the San Francisco Police Department's anonymous tip line at (415) 575-4444 or send a text to TIP411 and begin the message with SFPD.